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Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Operating Activities |  |  |  |  |
Net income | $ 46,310 | $ 26,191 | $ 132,184 | $ 49,123 |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | (1,371) | 0 | (786) |
Depreciation and amortization | 23,685 | 21,215 | 47,171 | 42,318 |
Deferred and noncurrent income tax charges |  |  | 14,605 | (9,468) |
Accretion of asset retirement obligations | 412 | 379 | 825 | 757 | $ 1,521
Pretax (gains) losses from sale of assets | 490 | 23 | (88,975) | 19 |
Net (increase) decrease in noncash operating working capital |  |  | 57,427 | (24,910) |
Equity in earnings of affiliates | 0 | 0 | 0 | 0 |
Other operating activities - net |  |  | 5,365 | 8,010 |
Net cash provided by (required by) continuing operations |  |  | 168,602 | 65,063 |
Net cash provided by discontinued operations |  |  | 0 | 12,753 |
Net cash provided by (required by) operating activities |  |  | 168,602 | 77,816 |
Investing Activities |  |  |  |  |
Property additions |  |  | (116,569) | (87,895) |
Proceeds from sale of assets |  |  | 86,298 | 91 |
Changes in restricted cash |  |  | 13,429 | 0 |
Other investing activities - net |  |  | (15,138) | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | (3,762) |
Net cash required by investing activities |  |  | (31,980) | (91,566) |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | (167,105) | (189,834) |
Borrowings of debt |  |  | 200,000 | 0 |
Repayments of debt |  |  | (10,165) | (46) |
Debt issuance costs |  |  | (3,240) | 0 |
Amounts related to share-based compensation |  |  | (4,237) | (3,030) |
Net distributions to parent |  |  | 0 | 0 |
Net cash provided by (required by) financing activities |  |  | 15,253 | (192,910) |
Net increase (decrease) in cash and cash equivalents |  |  | 151,875 | (206,660) |
Cash and cash equivalents at January 1 |  |  | 102,335 | 328,105 | 328,105
Cash and cash equivalents at June 30 | 254,210 | 121,445 | 254,210 | 121,445 | 102,335
Less: Cash and cash equivalents of held for sale | 0 | 976 | 0 | 976 |
Cash and cash equivalents | 254,210 | 120,469 | 254,210 | 120,469 | 102,335
Eliminations |  |  |  |  |
Operating Activities |  |  |  |  |
Net income | (46,310) | (27,562) | (132,183) | (49,908) |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Deferred and noncurrent income tax charges |  |  | 0 | 0 |
Accretion of asset retirement obligations | 0 | 0 | 0 | 0 |
Pretax (gains) losses from sale of assets | 0 | 0 | 0 | 0 |
Net (increase) decrease in noncash operating working capital |  |  | 0 | 0 |
Equity in earnings of affiliates | 46,310 | 27,562 | 132,183 | 49,908 |
Other operating activities - net |  |  | 0 | 0 |
Net cash provided by (required by) continuing operations |  |  |  | 0 |
Net cash provided by discontinued operations |  |  |  | 0 |
Net cash provided by (required by) operating activities |  |  | 0 | 0 |
Investing Activities |  |  |  |  |
Property additions |  |  | 0 | 0 |
Proceeds from sale of assets |  |  | 0 | 0 |
Changes in restricted cash |  |  | 0 | 0 |
Other investing activities - net |  |  | 0 | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | 0 |
Net cash required by investing activities |  |  | 0 | 0 |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | 0 | 0 |
Borrowings of debt |  |  | 0 | 0 |
Repayments of debt |  |  | 0 | 0 |
Debt issuance costs |  |  | 0 | 0 |
Amounts related to share-based compensation |  |  | 0 | 0 |
Net distributions to parent |  |  | 0 | 0 |
Net cash provided by (required by) financing activities |  |  | 0 | 0 |
Net increase (decrease) in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at January 1 |  |  | 0 | 0 | 0
Cash and cash equivalents at June 30 | 0 | 0 | 0 | 0 | 0
Less: Cash and cash equivalents of held for sale |  | 0 |  | 0 |
Cash and cash equivalents | 0 | 0 | 0 | 0 | 0
Parent Company |  |  |  |  |
Operating Activities |  |  |  |  |
Net income | 46,310 | 26,191 | 132,184 | 49,123 |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Deferred and noncurrent income tax charges |  |  | 0 | 0 |
Accretion of asset retirement obligations | 0 | 0 | 0 | 0 |
Pretax (gains) losses from sale of assets | 0 | 0 | 0 | 0 |
Net (increase) decrease in noncash operating working capital |  |  | 0 | 0 |
Equity in earnings of affiliates | (46,310) | (26,191) | (132,184) | (49,123) |
Other operating activities - net |  |  | 0 | 0 |
Net cash provided by (required by) continuing operations |  |  |  | 0 |
Net cash provided by discontinued operations |  |  |  | 0 |
Net cash provided by (required by) operating activities |  |  | 0 | 0 |
Investing Activities |  |  |  |  |
Property additions |  |  | 0 | 0 |
Proceeds from sale of assets |  |  | 0 | 0 |
Changes in restricted cash |  |  | 0 | 0 |
Other investing activities - net |  |  | 0 | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | 0 |
Net cash required by investing activities |  |  | 0 | 0 |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | (167,105) | (189,834) |
Borrowings of debt |  |  | 0 | 0 |
Repayments of debt |  |  | 0 | 0 |
Debt issuance costs |  |  | 0 | 0 |
Amounts related to share-based compensation |  |  | 0 | 0 |
Net distributions to parent |  |  | 167,105 | 189,834 |
Net cash provided by (required by) financing activities |  |  | 0 | 0 |
Net increase (decrease) in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at January 1 |  |  | 0 | 0 | 0
Cash and cash equivalents at June 30 | 0 | 0 | 0 | 0 | 0
Less: Cash and cash equivalents of held for sale |  | 0 |  | 0 |
Cash and cash equivalents | 0 | 0 | 0 | 0 | 0
Issuer |  |  |  |  |
Operating Activities |  |  |  |  |
Net income | 46,310 | 26,191 | 132,184 | 49,123 |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | 0 | 0 | 0 |
Depreciation and amortization | 23,685 | 21,215 | 47,171 | 42,318 |
Deferred and noncurrent income tax charges |  |  | 14,605 | (9,468) |
Accretion of asset retirement obligations | 412 | 379 | 825 | 757 |
Pretax (gains) losses from sale of assets | 490 | 23 | (88,975) | 19 |
Net (increase) decrease in noncash operating working capital |  |  | 57,427 | (24,910) |
Equity in earnings of affiliates | 0 | (1,371) | 1 | (785) |
Other operating activities - net |  |  | 5,365 | 8,010 |
Net cash provided by (required by) continuing operations |  |  |  | 65,064 |
Net cash provided by discontinued operations |  |  |  | 0 |
Net cash provided by (required by) operating activities |  |  | 168,603 | 65,064 |
Investing Activities |  |  |  |  |
Property additions |  |  | (116,569) | (87,895) |
Proceeds from sale of assets |  |  | 86,298 | 91 |
Changes in restricted cash |  |  | 13,429 | 0 |
Other investing activities - net |  |  | (15,138) | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | 0 |
Net cash required by investing activities |  |  | (31,980) | (87,804) |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | 0 | 0 |
Borrowings of debt |  |  | 200,000 | 0 |
Repayments of debt |  |  | (10,165) | (46) |
Debt issuance costs |  |  | (3,240) | 0 |
Amounts related to share-based compensation |  |  | (4,237) | (3,030) |
Net distributions to parent |  |  | (167,106) | (180,878) |
Net cash provided by (required by) financing activities |  |  | 15,252 | (183,954) |
Net increase (decrease) in cash and cash equivalents |  |  | 151,875 | (206,694) |
Cash and cash equivalents at January 1 |  |  | 102,335 | 327,163 | 327,163
Cash and cash equivalents at June 30 | 254,210 | 120,469 | 254,210 | 120,469 | 102,335
Less: Cash and cash equivalents of held for sale |  | 0 |  | 0 |
Cash and cash equivalents | 254,210 | 120,469 | 254,210 | 120,469 | 102,335
Guarantor Subsidiaries |  |  |  |  |
Operating Activities |  |  |  |  |
Net income | 0 | 0 | (1) | (1) |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Deferred and noncurrent income tax charges |  |  | 0 | 0 |
Accretion of asset retirement obligations | 0 | 0 | 0 | 0 |
Pretax (gains) losses from sale of assets | 0 | 0 | 0 | 0 |
Net (increase) decrease in noncash operating working capital |  |  | 0 | 0 |
Equity in earnings of affiliates | 0 | 0 | 0 | 0 |
Other operating activities - net |  |  | 0 | 0 |
Net cash provided by (required by) continuing operations |  |  |  | (1) |
Net cash provided by discontinued operations |  |  |  | 0 |
Net cash provided by (required by) operating activities |  |  | (1) | (1) |
Investing Activities |  |  |  |  |
Property additions |  |  | 0 | 0 |
Proceeds from sale of assets |  |  | 0 | 0 |
Changes in restricted cash |  |  | 0 | 0 |
Other investing activities - net |  |  | 0 | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | 0 |
Net cash required by investing activities |  |  | 0 | 0 |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | 0 | 0 |
Borrowings of debt |  |  | 0 | 0 |
Repayments of debt |  |  | 0 | 0 |
Debt issuance costs |  |  | 0 | 0 |
Amounts related to share-based compensation |  |  | 0 | 0 |
Net distributions to parent |  |  | 1 | 1 |
Net cash provided by (required by) financing activities |  |  | 1 | 1 |
Net increase (decrease) in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at January 1 |  |  | 0 | 0 | 0
Cash and cash equivalents at June 30 | 0 | 0 | 0 | 0 | 0
Less: Cash and cash equivalents of held for sale |  | 0 |  | 0 |
Cash and cash equivalents | 0 | 0 | 0 | 0 | 0
Non-Guarantor Subsidiaries |  |  |  |  |
Operating Activities |  |  |  |  |
Net income | 0 | 1,371 | 0 | 786 |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Income from discontinued operations, net of tax | 0 | (1,371) | 0 | (786) |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Deferred and noncurrent income tax charges |  |  | 0 | 0 |
Accretion of asset retirement obligations | 0 | 0 | 0 | 0 |
Pretax (gains) losses from sale of assets | 0 | 0 | 0 | 0 |
Net (increase) decrease in noncash operating working capital |  |  | 0 | 0 |
Equity in earnings of affiliates | 0 | 0 | 0 | 0 |
Other operating activities - net |  |  |  | 0 |
Net cash provided by (required by) continuing operations |  |  |  | 0 |
Net cash provided by discontinued operations |  |  |  | 12,753 |
Net cash provided by (required by) operating activities |  |  | 0 | 12,753 |
Investing Activities |  |  |  |  |
Property additions |  |  | 0 | 0 |
Proceeds from sale of assets |  |  | 0 | 0 |
Changes in restricted cash |  |  | 0 | 0 |
Other investing activities - net |  |  | 0 | 0 |
Investing activities of discontinued operations |  |  |  |  |
Sales proceeds |  |  | 0 | 0 |
Other |  |  | 0 | (3,762) |
Net cash required by investing activities |  |  | 0 | (3,762) |
Financing Activities |  |  |  |  |
Purchase of treasury stock |  |  | 0 | 0 |
Borrowings of debt |  |  | 0 | 0 |
Repayments of debt |  |  | 0 | 0 |
Debt issuance costs |  |  | 0 | 0 |
Amounts related to share-based compensation |  |  | 0 | 0 |
Net distributions to parent |  |  | 0 | (8,957) |
Net cash provided by (required by) financing activities |  |  | 0 | (8,957) |
Net increase (decrease) in cash and cash equivalents |  |  | 0 | 34 |
Cash and cash equivalents at January 1 |  |  | 0 | 942 | 942
Cash and cash equivalents at June 30 | 0 | 976 | 0 | 976 | 0
Less: Cash and cash equivalents of held for sale |  | 976 |  | 976 |
Cash and cash equivalents | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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